| commit | ac1fd419b6d2af8b0e69b13fa5c794705095db0a | [log] [tgz] |
|---|---|---|
| author | Rémy Oudompheng <remyoudompheng@gmail.com> | Thu Mar 05 07:59:00 2020 +0100 |
| committer | Robert Griesemer <gri@golang.org> | Wed Apr 08 20:53:58 2020 +0000 |
| tree | 59070e2d53e5fd1e2d6b9d2638c1afbb21c8c267 | |
| parent | a59465b545cd66e0796b5c7649a87a6f1b657cb4 [diff] |
math/big: correct off-by-one access in divBasic The divBasic function computes the quotient of big nats u/v word by word. It estimates each word qhat by performing a long division (top 2 words of u divided by top word of v), looks at the next word to correct the estimate, then perform a full multiplication (qhat*v) to catch any inaccuracy in the estimate. In the latter case, "negative" values appear temporarily and carries must be carefully managed, and the recursive division refactoring introduced a case where qhat*v has the same length as v, triggering an out-of-bounds write in the case it happens when computing the top word of the quotient. Fixes #37499 Change-Id: I15089da4a4027beda43af497bf6de261eb792f94 Reviewed-on: https://go-review.googlesource.com/c/go/+/221980 Reviewed-by: Robert Griesemer <gri@golang.org>
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